The index closed 3.09 points higher after gaining 4.02 points in the previous session.
Trading on the Ho Chi Minh Stock Exchange increased by 21.1% to VND21.618 trillion (US$850.3 million).
The VN-30 basket, comprising the 30 largest capped stocks, saw 11 tickers gained.
GVR of Vietnam Rubber Group gained 3.4%, CTG of state-owned lender VietinBank grew 2.1%, and MWG of electronics retail chain Mobile World went up 1.5%.
Fifteen blue chips fell. POW of electricity producer Petrovietnam Power Corporation slid 2.2%, BCM of Becamex Investment and Industrial Development lost 2.0%, and VNM of dairy giant Vinamilk closed 0.9% lower.
Foreign investors were net seller to the tune of VND1.105 trillion, mainly selling HPG of steelmaker Hoa Phat Group and POW of Petrovietnam Power Corporation.
The HNX-Index for stocks on the Hanoi Stock Exchange, home to mid and small caps, rose 0.44%, while the UPCoM-Index for the Unlisted Public Companies Market went up 0.71%.